By [email protected] Airborne wind energy players are still hustling to get generators up in the air despite the major setback suffered by sector front-runner Makani Power this February, when it lost Google’s parent Alphabet as an investor.

At least three European startups say they’re nearing commercialization in a sector with a high bar to clear as traditional wind and solar continue to see price declines. Behind them are another 10 or so companies attempting to bring to market a diverse range of concepts involving tethered structures that capture high-altitude wind energy and deliver it to the ground.